what's mean of unseen speakers and overlapped speakers?

[lt573152873]

[Zhaans]

Overlapped is for one speaker only.You work only with one speaker, let's say you get s1 speaker and split their videos into train and validation. While for Unseen your train folder contains speakers s1, .., s20, and for validation you use speakers s21, s22 etc., so you validate on unseen speaker during train. So it's better to train unseen speakers, it will be fair.